WO1980000631A1 - Amelioration des assemblages d'actionnement de pedaliers par dash-pot a solenoide - Google Patents

Amelioration des assemblages d'actionnement de pedaliers par dash-pot a solenoide Download PDF

Info

Publication number
WO1980000631A1
WO1980000631A1 PCT/US1979/000731 US7900731W WO8000631A1 WO 1980000631 A1 WO1980000631 A1 WO 1980000631A1 US 7900731 W US7900731 W US 7900731W WO 8000631 A1 WO8000631 A1 WO 8000631A1
Authority
WO
WIPO (PCT)
Prior art keywords
dashpot
solenoid
piston
cylinder
invention defined
Prior art date
Application number
PCT/US1979/000731
Other languages
English (en)
Inventor
T Wilkes
V Ramsey
Original Assignee
Teledyne Ind
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teledyne Ind filed Critical Teledyne Ind
Priority to DE792953114A priority Critical patent/DE2953114A1/de
Publication of WO1980000631A1 publication Critical patent/WO1980000631A1/fr

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10F—AUTOMATIC MUSICAL INSTRUMENTS
    • G10F5/00—Details or accessories
    • G10F5/02—Actions

Definitions

  • the present invention is an even greater improvement in reducing the noise and at the same time providing a more positive and realistic sound as if the pedal were actuated by a human foot.
  • Figure 1 is a schematic diagram illustrating the pedal linkage system incorporating the invention
  • Figure 2 is a side, partial cross-sectional, view of a solenoid-dashpot actuator assembly incorporating the invention
  • Figure 3 is an end view from the right-hand of Fig. 2 also in partial showing section the dashpot of the solenoid dashpot assembly;
  • Figure 4 is a top plan view of Figure 3 showing the solenoid-dashpot actuator incorporating the invention
  • Figure 5 illustrates the needle valve and felt asse bly for moderating the flow of fluid to an form the dashpot cylinder.
  • the foot pedal 10 of a conventional piano is pivoted on a fulcrum 11 and has a linkage 12 coupled to the inner end 13 of pedal 10.
  • Linkage 12 is coupled to the piano mechanism for moderating sound produced by the piano according to the desire of the player.
  • a spring 14 is diagrammatically illustrated as forcing pedal 19 in a counter clockwise or up direction. The foot of the player normally rests on or above pedal
  • Actuator arm 19 is pivoted on a fulcrum or pivot point 20 and, when actuator arm 19 is rotated in a counter clockwise direction about pivot 20, link 17 is moved downwardly to cause foot 14 to depress downwardly on pedal 10 to thereby actuate the pedal of the piano and therefore moderate the playing of the piano in the usual way.
  • a solenoid-dashpot assembly 21 which includes a dashpot 21D and a solenoid 21S receives energizing signals from a signal source 22.
  • Signal source 22 in the preferred embodiment, includes a magnetic tape cassette player assembly,T supplying signals to solenoid driver SD, which are connected by conductors C to the solenoids 21S, there being a solenoid driver for each solenoid.
  • tape cassette player assembly tape which carry the information operating the piano pedals in conjunction with the normal playing of the piano by other devices not here relevant, the signals on the tape are decoded to provide operating signals for the solenoids 21S.
  • the solenoid, dashpot and spring mechanism for operating the actuator arm 19 have a spring S serving to maintain the linkage system in a balanced state, that is, the force acting downwardly on link 17 by spring S in the actuator and the weight of the component parts are just sufficient to maintain the linkage in condition such that there are no lost motions at any joint or connection to thereby enhance the performance (recreation of the musical presentation) and assure silent linkage operation.
  • the solenoid-dashpot act uator assembly of the present invention is shown as including a metal base plate 30 supporting a fulcrum 31 having pivot 20 thereon for actuator arm 19.
  • the pivot 20 includes nylon hearings or bushings 21 (see Fig. 4)
  • Fulcrum 31 is bolted to the base plate 30, there being a series of holes (not shown) for adjusting the position of fulcrum 31 to permit adaptation to pianos of various manufactures.
  • a series of holes (not shown) is provided in actuator arm 19 for receiving the pivot and the nylon bearings discussed earlier.
  • the solenoid-dashpot assembly is in the actuating state with the actuator arm 19 having been rotated in a counter clockwise direction.
  • the present invention is concerned primarily with the construction of the solenoid-dashpot assembly 21.
  • a U-shaped bracket 32 having a pair of depending legs 33 bolted to base plate 30 has boated thereto a pair of solenoid-dashpot actuators, one for the soft pedal of the piano and one for the sustain pedal. There can, of course, be a further solenoid to actuate the third or bass pedal of the piano if desired.
  • Mounting bracket 32 has a cross arm 34 connecting legs 33 and it is on cross arm 34 that the solenoid-dashpot are actually mounted.
  • the solenoid-dashpot assembly 21 include a solenoid 21S and a dashpot 21D.
  • the solenoid 21S is of a short stroke type which is commercially available and has a relatively large armature 36.
  • Armature 36 has a conical portion 37 and a shank portion 38, the end 39 of which engages a neoprene insert 40 in the underside of actuator arm 19.
  • the shank portion 38 of solenoid armature 36 is threaded as indicated at 41.
  • a flat metal washer 42 is secured to the lower end of armature 36 and a pad 43 is seated on the washer so that on the inward or actuation stroke of the solenoid the solenoid does not fully bottom out so that there is not metal to metal clacking.
  • action is urging the linkag 17 in an upward direction which urges actuator arm 19 in a clockwise direction (which is at the same time opposed or balanced to a certain degree.
  • a further pad 46 is mounted on a threaded shaft 47 and held in position by a lock nut 48 so as to cushion or shock absorb the movement of the armature 36 of the solenoid 21S.
  • the cushioning or shock absorbing or the movement of the solenoid at both ends of its stroke or silencing purposes is well known in the art and need not be further discussed herein.
  • Pad 46 is supported on threaded shaft 47 by a washer plate 49.
  • the solenoid housing 50 is provided with a pair of bolts 51-52 which project through the leg 34 of the mounting bracket 30 and is secured therein with the threaded portion 41 of solenoid armature 38 projecting therethrough.
  • a dashpot cylinder 56 which is of lightweight stamped metal and having smooth interior walls is secured in aligned relation with the solenoid 21S and is secured in position by threaded bolts 51 projecting from the solenoid 21S through aligned holes in mounting bracket 30.
  • a pair nuts and lock, washers 52, 53 secures this assembly in rigid relation.
  • Spring S is placed over the extended shaft 38 of the solenoid and, as described earlier herein, the spring acts in opposition to the action of spring 14 of the piano action.
  • spring 14 is merely diagrammatically illustrated in the position shown, it could be any other place in the piano action. It is, however, a feature of the present invention that spring S is included in the solenoid-dashpot assembly.
  • the lower end of spring S bears against the bottom of dashpot cylinder 56 and the upper end bears on the underside of the dashpot piston 60.
  • Dashpot piston 60 has a threaded bore 62 which is threadably engaged with the threads 41 on armature 34 and hence moves therewith. The position of dashpot piston 60 can be adjusted along the threaded shaft 41 and is locked in position by a lock nut 63.
  • Dashpot piston 60 can be of metal or plastic as can be the dashpot cylinder 56.
  • the dashpot cylinder is of an aluminum stamping and the dashpot piston is of aluminum.
  • An annular groove 65 is formed in peripheral edge 66 of dashpot piston 60.
  • An annular O-ring 70 is received in peripheral groove or slot. This O-ring is selected to be just a few thousands of an inch larger than the inside diameter of dashpot cylinder 56 and it completely floats in groove 65 so that if the piston 60 moves slightly to one side or the other it doesn't force the O-ring hard against that side; the O-ring just slips inside the groove 65 and its diameter is smaller than the worst case centering of piston 60 in dashpot cylinder 56.
  • the objective is to achieve a low coefficient of friction so as to not reduce the force of the solenoid and just reduce or moderate the velocity.
  • the O-ring 70 floats inside groove 65.
  • the groove in the piston is slightly larger than the diameter of the O-ring so that it has a very little slop to thereby avoid any binding.
  • the O-ring floats in the groove so that if the piston moves lightly off center it can't cause the O-ring to press harder against the wall of cylinder 56.
  • the piston diameter is about 60 to 80,00 of an inch smaller than dashpot cylinder 56.
  • the O-ring 70 is of high quality industrial grade O-ring and at the time of assembly of the piston, O-ring and dashpot cylinder 56 a small amount of dry graphite is applied to the assembly and worked into the aluminum walls of the piston to increase the smoothness and lubricity of the surface after a L ⁇ ttle bit of operation:
  • a pair of constictions 80, 81 are provided in piston 60. These passages 80 and 81 are threaded and received a needle valve elements 82 and 83, respectively. As shown in Figure 5, each needle valve element 82 and 83 has a threaded shaft 84 which has one flat side 86. A large felt pad 87 is provided concentric with the threaded shaft 82 of the needle valve and a knurled thumb adjustment 88 is formed on the upper end of the needle valve 82.
  • An enlarged flange or should 89 also formed beneath the knurlations 88 to compress and assure uniformity in the action of the felt pads 87 in muffling the sound of air rushing through the portions of apertures 80 and ⁇ l left open by the cut-off portion of flat 86 of needle valve 82.
  • Pads 87 are felt material and significantly muffle the sound of rushing air without affecting the dashpot action desired.
  • Two constricted apertures are provided in the preferred embodiment but, with large dashpot assemblies, or smaller dashpot assemblies, more or less constricted apertures may be provided, the basic objective of the pads being to muffle the sound of air rushing through the consticted passages.
  • a pair of solenoiddashpot assemblies 21 are mounted on the bracket 30
  • a ground wire 90 commonly connect the solenoid assemblies and all metal parts to electrical ground, not shown.
  • the dashpot thus linearizes the solenoid.
  • the dashpot action is a double action that is, the air rushes into the dashpot cylinder on actuation of the solenoid via the constricted passages and rushes out of the dash cylinder via the constricted passages upon deactuation of the solenoid.
  • the dashpot .orifices are adjustable by virture of the tapered needle valve elements 82 and 83.
  • the solenoids are shown as partially energized but the dashpot piston is shown in a fully actuated state soley for purposes of exposition of the invention.
  • the pad 43 at the bottom of solenoid armature 36 is, in actuality, in an engagement with the housing 50 of the solenoid and prevents the cone of the armature from engaging the internal cone of the solenoid to thereby avoid the metallic sound. While a preferred embodiment of the invention has been disclosed herein, it will be appreciated that other embodiments and modifications of the invention will be suggested to those skilled in the art and it is intended that such modifications be encompassed by the following claims:

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electromagnets (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

Un assemblage de dash-pot a solenoide pour actionner les pedaliers d'un piano mecanique afin de mieux correspondre au toucher d'un executant, au lieu de l'effet de sons caverneux associes aux pianos electro-mecaniques. La pedale du piano (10) est reliee a l'armature (36) d'un assemblage de dash-pot a solenoide par la liaison d'interconnexion (17). Le piston d'amortissement (60) est fixe de maniere ajustable a la partie tige de l'armature (38) pour se mouvoir a l'interieur du cylindre du dash-pot (56). Une rainure annulaire (65) formee dans le bord peripherique (66) du piston (60) recoit de maniere flottante des joints toriques (70) pour isoler la chambre a l'interieur du cylindre (56) du milieu ambiant au-dessus du piston (60). Une paire de soupapes a pointeau (82, 83) s'etendent au travers du piston (60) fournissant des passages d'air variablement restreints pour controler la reponse de l'assemblage du dash-pot a solenoide (21). Des coussinets en feutre (87) assourdissent le son de l'air passant au travers des ouvertures (80, 81).
PCT/US1979/000731 1978-09-19 1979-09-17 Amelioration des assemblages d'actionnement de pedaliers par dash-pot a solenoide WO1980000631A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE792953114A DE2953114A1 (en) 1978-09-19 1979-09-17 Improvements in solenoid dashpot pedal actuator assemblies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/943,896 US4216694A (en) 1978-09-19 1978-09-19 Solenoid dashpot pedal actuator assemblies
US943896 1978-09-19

Publications (1)

Publication Number Publication Date
WO1980000631A1 true WO1980000631A1 (fr) 1980-04-03

Family

ID=25480443

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1979/000731 WO1980000631A1 (fr) 1978-09-19 1979-09-17 Amelioration des assemblages d'actionnement de pedaliers par dash-pot a solenoide

Country Status (8)

Country Link
US (1) US4216694A (fr)
EP (1) EP0020478B1 (fr)
JP (1) JPS6325357B2 (fr)
AU (1) AU523933B2 (fr)
CA (1) CA1122826A (fr)
DE (1) DE2953114A1 (fr)
GB (1) GB2043981B (fr)
WO (1) WO1980000631A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0291547A (ja) * 1988-09-29 1990-03-30 Sankyo Co Ltd 水分含量測定法
JPH0726893U (ja) * 1993-10-08 1995-05-19 ヤマハ株式会社 自動演奏装置
JPH0726891U (ja) * 1993-10-08 1995-05-19 ヤマハ株式会社 鍵盤楽器の自動演奏装置
US5592780A (en) * 1995-06-07 1997-01-14 Checkovich; Peter Door position controlling apparatus
US5905220A (en) * 1997-03-27 1999-05-18 Burgett, Inc. Method and apparatus for sensing pedal motion and actuating pedals in player pianos
DE202004019395U1 (de) * 2003-12-02 2005-04-14 Karl Simon Gmbh & Co. Kg Anschlagdämpfer
WO2016200483A1 (fr) * 2015-06-12 2016-12-15 Steinway, Inc. Sourdine étendue de piano
CN110111757A (zh) * 2019-04-11 2019-08-09 宿州学院 一种钢琴支撑调平装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US753809A (en) * 1901-08-14 1904-03-01 Imp Corp Automatic playing apparatus for musical instruments.
US1165903A (en) * 1913-01-29 1915-12-28 Telelectric Company Playing apparatus for musical instruments.
US1184244A (en) * 1914-06-04 1916-05-23 John F Kelly Electric piano-player with damping device.
US1313877A (en) * 1919-08-26 Gssignob to sears b
US2417504A (en) * 1944-05-11 1947-03-18 Weatherhead Co Cable tension regulator
US2825427A (en) * 1953-08-13 1958-03-04 Dumore Company Hydraulic dashpot
US2868336A (en) * 1954-03-08 1959-01-13 Veeder Root Inc Air dashpot

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR452536A (fr) * 1912-03-07 1913-05-19 Fernand Eugene Cuenoud Commande électromagnétique pour instruments de musique à clavier
GB191399A (fr) * 1922-01-09 1924-01-24 Fernand Nunes
US3990687A (en) * 1976-02-05 1976-11-09 Curnutt Charles R Shock absorber with controlled fluid bypass means

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1313877A (en) * 1919-08-26 Gssignob to sears b
US753809A (en) * 1901-08-14 1904-03-01 Imp Corp Automatic playing apparatus for musical instruments.
US1165903A (en) * 1913-01-29 1915-12-28 Telelectric Company Playing apparatus for musical instruments.
US1184244A (en) * 1914-06-04 1916-05-23 John F Kelly Electric piano-player with damping device.
US2417504A (en) * 1944-05-11 1947-03-18 Weatherhead Co Cable tension regulator
US2825427A (en) * 1953-08-13 1958-03-04 Dumore Company Hydraulic dashpot
US2868336A (en) * 1954-03-08 1959-01-13 Veeder Root Inc Air dashpot

Also Published As

Publication number Publication date
AU523933B2 (en) 1982-08-19
EP0020478A1 (fr) 1981-01-07
GB2043981A (en) 1980-10-08
EP0020478A4 (fr) 1981-08-27
DE2953114C2 (fr) 1989-11-02
CA1122826A (fr) 1982-05-04
GB2043981B (en) 1982-12-22
US4216694A (en) 1980-08-12
AU5095479A (en) 1980-03-27
DE2953114A1 (en) 1980-12-18
JPS56501263A (fr) 1981-09-03
EP0020478B1 (fr) 1984-03-14
JPS6325357B2 (fr) 1988-05-25

Similar Documents

Publication Publication Date Title
US4217803A (en) Piano-action keyboard
EP0020478B1 (fr) Amelioration des assemblages d'actionnement de pedaliers par dash-pot a solenoide
US4562764A (en) Electronic musical performance
US5243125A (en) Keyboard apparatus for electronic musical instrument having cooperating jacks and hammers
US20010000569A1 (en) Key actuation systems for keyboard instruments
WO1980000278A1 (fr) Actionneur a pedale pour piano electronique
US5506369A (en) Electromagnetic actuator used for keyboard musical instrument
US5079985A (en) Keyboard apparatus for electronic keyboard musical instrument
JPH1083224A (ja) 車両用アクセルペダル装置
US4273017A (en) Piano action keyboard with roller and elastic diaphragm transducer
JP2907538B2 (ja) 車両用アクセルペダル装置
US2471690A (en) Auxiliary throttle valve control
US3175451A (en) Double touch key for musical instruments
EP0022817A4 (fr) Clavier a action de piano.
US5081893A (en) Striker solenoid assembly for player and reproducing pianos
JPS6323754Y2 (fr)
JPH058635Y2 (fr)
US2601185A (en) Action for key-operated musical instruments of percussion type
US5091613A (en) Pedal board for musical instruments
WO1980000279A1 (fr) Appareil et methode d'actionnement d'une pedale d'un piano electronique
KR20210090363A (ko) 전자식 가속 페달장치
EP0018987A1 (fr) Appareil vorsetzer
JP3743877B2 (ja) 鍵盤装置
US1289449A (en) Pianissimo device for pianos.
JPS5814389Y2 (ja) 電子オルガンのペダル鍵盤装置

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): DE GB JP

AL Designated countries for regional patents

Designated state(s): FR

RET De translation (de og part 6b)

Ref country code: DE

Ref document number: 2953114

Date of ref document: 19801218

Format of ref document f/p: P